Batteries in multi battery mods need to be the same manufacturer, model, age, and # of charge cycles. They need to be "married" i.e. used together all the time. You can move them around in different multi battery mods, just so long as they are used together and charged together.
There is no such thing as a 35 or 40 amp 18650 battery. The highest powered batteries are the LG HB2,4, or 6 and the Sony VTC3 at 30A continuous discharge rate. Since I value my house, face, and hands I only use LG, Samsung, or Sony batteries. Anything else is a re-wrap with inflated specs that you actually pay more for than the genuine.